I love to volunteer. Street fairs, festivals, service clubs, no matter what it is, it feels great to be a part of a greater good. You could spend a few hours at the library organizing periodicals, or doing other tasks that are continually left undone for lack of personnel. Visit a women's shelter or hospital (find out if the pediatric ward could use a storyteller). Call your church to discover projects just waiting for someone to help out.
I registered to volunteer for the 2002 Winter Olympics in Salt Lake City. I invited some of my friends to sign up with me and all they saw was what hard work it would be. All I could see was all the interesting people I would meet, from all over the world, and all the opportunities that would present themselves outside of the job I would be doing. It turned out that they had more applicants than jobs so the fact that I lived in California, and not Utah, I was bumped.
I've met more interesting people, and had tons of fun volunteering. Find something you like to do, and find a place you can help. No matter what the outcome, it'll bring rewards you can't foresee! Go, volunteer, and have fun!